TV series example of the word

The Big Bang Theory Season 11, Episode 10
Wait, so you were making your hair look like that on purpose?

Breaking Bad Season 5, Episode 8
I give you that list, I've served my purpose.

The Big Bang Theory Season 1, Episode 10
Yeah, for a noble purpose.

The Big Bang Theory Season 4, Episode 4
Its size is completely disproportionate to its purpose.

The Big Bang Theory Season 5, Episode 19
On purpose.